<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>元素定点圆环扩散动画</title>
    <style>
      .blobs-container {
        width: 500px;
        height: 500px;
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: bisque;
      }

      .blob {
        background: rgba(122, 122, 122, 0.151);
        border-radius: 50%;
        box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.089);
        height: 2px;
        width: 2px;
        transform: scale(1);
        animation: pulse-black 2s infinite;
      }

      @keyframes pulse-black {
        0% {
          transform: scale(0.95);
          opacity: 1;
          box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.7);
        }

        70% {
          transform: scale(1);
          opacity: 0.7;
          box-shadow: 0 0 0 1px rgba(0, 0, 0, 0);
        }

        100% {
          transform: scale(100);
          opacity: 0;
          box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
        }
      }
    </style>
  </head>
  <body>
    <div class="blobs-container">
      <div class="blob"></div>
    </div>
  </body>
</html>
